Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

Kawthar Frikha, Simona Bennici, Jamel Bouaziz, Kamel Chaari and Lionel Limousy
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Kawthar Frikha: Institut de Science des Materiaux, CNRS, IS2M UMR 7361, Université de Haute-Alsace, F−68100 Mulhouse, France
Simona Bennici: Institut de Science des Materiaux, CNRS, IS2M UMR 7361, Université de Haute-Alsace, F−68100 Mulhouse, France
Jamel Bouaziz: Laboratoire de Chimie Industrielle, Département de Génie des Matériaux, Université de Sfax, Ecole Nationale d’Ingénieurs de Sfax, BP 1173, Sfax 3038, Tunisie
Kamel Chaari: Laboratoire de Chimie Industrielle, Département de Génie des Matériaux, Université de Sfax, Ecole Nationale d’Ingénieurs de Sfax, BP 1173, Sfax 3038, Tunisie
Lionel Limousy: Institut de Science des Materiaux, CNRS, IS2M UMR 7361, Université de Haute-Alsace, F−68100 Mulhouse, France

Energies, 2020, vol. 13, issue 12, 1-21

Abstract: Three series of binary metal oxide catalysts containing Ni, Cu, or Co oxides were prepared, fully characterized and tested in CO oxidation. The catalysts, with a constant transition metal loading of 10 wt%, were prepared from metal nitrates and urea mixtures by a microwave-assisted solution combustion method. The RV/OV ratio, corresponding to the stoichiometry of the reactants, calculated from their elemental oxidizing and reducing valences, was varied. In order to modify the redox character of the synthesis medium from the quantity of urea; an excess of urea was used for attaining reducing conditions, while a deficit of urea shifted the medium to oxidizing conditions. Three RV/OV ratios (0.9, 1.0, and 1.1) were selected to elaborate the different binary metal oxide catalysts, nine oxide catalysts were synthesized. Then, the influence of the stoichiometry (RV/OV ratio) on the bulk and surface properties of the binary metal oxide catalysts was investigated. Similarly, the influence of the RV/OV ratio on the CO oxidation activity was discussed and the optimal value of RV/OV ratio was identified. The results show that the increasing of the RV/OV ratio from 0.9 to 1.1, particularly in Ni- and Co-containing catalysts, induces stronger metal-aluminum interactions, in the form of aluminates phases, and that are correlated to the dramatic reduction of the CO oxidation activity. The best physicochemical properties and highest catalytic activities were achieved with the catalysts prepared in redox systems stoichiometrically balanced (RV/OV = 1). The Cu-containing catalysts presented the best catalytic activities in CO oxidation.

Keywords: Ni; Cu; or Co oxides; CO oxidation; microwave-assisted solution combustion; influence of the stoichiometry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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